Question

# Why do we apply paint on iron articles?

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Hint:
Slowly eating away of metal due to the attack of air, water, moisture, and chemical present in the environment is known as corrosion.
Corrosion of iron particles is called rusting. When iron reacts with water air and oxygen presents in the environment it forms a reddish-brown layer on it which is called rust and this process is called rusting.

The formation of rust requires iron, water, and oxygen. Although it's a complex process, the chemical equation is simply $4Fe$ + $3O_2$ + $6H_2O$ → $4Fe(OH)_3$